according to previous studies, the genus rheum in iran includes four species: r. turkestanicum janisch., r. persicum losinsk., r. ribes l. and r. khorasanicum baradaran & jafari. during the long-term study, based on field and many herbaria specimens, three new species including r. iranshahrii taheri & assadi sp. nov., r. kordestanicum taheri & assadi sp. nov. and r. austro-iranicum taheri & ass...

Mehdi Jafari, Arash Rashidian, Farid Abolhasani, Kazem Mohammad, Shahram Yazdani, Patricia Parkerton, Masud Yunesian, Feizollah Akbari and Mohammad Arab* Department of Health Services Management, School of Health Services Management, Iran University of Medical Sciences, Tehran, Iran Department of Health Management and Economics, School of Public Health, Tehran University of Medical Sciences, Te...

The particle-hole continuum in the Dirac sea of graphene has a unique window underneath, which in principle leaves room for bound state formation in the triplet particle-hole channel (Baskaran and Jafari 2002 Phys. Rev. Lett. 89 016402). In this work, we construct appropriate triplet particle-hole operators and, using a repulsive Hubbard-type effective interaction, we employ equations of motio...

A Roman dominating function on a graph G = (V,E) is a function f : V → {0, 1, 2} such that every vertex v ∈ V with f(v) = 0 has at least one neighbor u ∈ V with f(u) = 2. The weight of a Roman dominating function is the value f(V (G)) = ∑ u∈V (G) f(u). The minimum weight of a Roman dominating function on a graph G is called the Roman domination number, denoted by γR(G). The Roman bondage number...

Employees are expected to perform specific roles in an organization as specified by their job descriptions and superior’s expectations. Bidarian Jafari (2012) found that employees play important role activities the organization, such social interaction with colleagues leaders conduct activities. These extra-role behavior’ behaviors termed Organizational Citizenship Behavior (OCB). Although many...

Zhouchao Wei∗ School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, P. R. China Division of Dynamics, Technical University of Lodz, Lodz, Stefanowskiego 1/15, 90-924, Poland College of Mechanical Engineering, Beijing University of Technology, Beijing 100124, P. R. China Mathematical Institute, University of Oxford, Oxford, OX2 6GG, England [email protected]...

Following the publication of [...]

The purpose of this paper is to introduce the notions g̃-R0, g̃-R1, g̃-T0, g̃-T1 and g̃-T2 in bitopological spaces.